Air-feed control for stopers



Jan. 6 1926.

. c. c. HANSEN AIR FEED CONTROL FOR s'rorsns Filed May 28, 1925 2 Sheets-Sheet 1 u a? J M y N J ir 0 H \\f. II. I llllll I III] .lllllll Jan. 26 192.6.v 1,570,964

\ c. c. HANSEN AIR FEED CONTROL FOR STOPERS Filed May 28, 1925 2 Sheets-Sheet 2 INVENTOR.

11a edt'fliz en. BY W HISATTO NEY' y ltl Patented Jan 25, 'lf lzti,

Uh'i'l fiil STATES? CHARLES C. HANSEN, OF EASZON, TEENNSYLVANJIA, ASSIGNOE TO ENG-W COMPANY, OF JERSEY CITY, NEW JERSEY, A QF l AIR-FEED COZITRUL FOR STGL EES.

Application filed May 2 T 0 all cell 0m it may concern:

Be it known that I, (hninnns G. Hansnrn a citizen of the United States and a resident of llastom county l-lorthampton, and State of Pennsylvania have invented a certain Air-Feed Control for Stopers, of which the following is a specificatioin aocompanied by drawings.

This invention relates to fluid actuated rock drills, but more particularly to controlling devices for the air feeding element which aovances the machine in ac cordance with the depth of penetration of the drill steel into the work.

One object of the invention is to enable the air feeding element to be readily controlled in an improved and simplified manner by the operator without removing his hand from the rotation handle.

Another object of the invention is to control admission of pressure fluid into the feeding element and to control the exhaust of pressure fluid therefrom by means of a fluid actuated valve.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements, features of construction and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in tlie'accompanying drawings, in Which Figure 1 is a view in elevation partly in section of a stoper type rock drill constructed in accordance with the practice of the invention,

Figure 2 is an enlarged detail elevational View in section showing the air feed controlling valve in position to admit pressure fluid to the feeding cylinder,

Figure 3 is a view in elevation partly broken away and showing the manner in which the valve chamber communicates with the rotation handle, and

Figure 4 is a View similar to Figure showing the valve chamber and the feedin cylinder open to atmosphere.

Referring to the drawings, the invention is shown embodied in a stoper type rock drill having a hammer cylinder A. and a back head B held in operative position by bolts C. The cylinder A supports a fron' head D and the cylinder A and front head S, 1925. Serial No. 33,468.

D held together by means of spring pressed side bolts E. Any suitable in 7 may be provided for rotating the l steel F supported by the front head. this instance a hollow rotation handle is secured to the back head 13 and adapt-- ed to be grasped by the operator for rotating the drill and steel as a unit.

The feeding element com arises a ing cylinder H which is also held in or crative position by the bolts C; and a piston J, arranged to reciprocate within the feeding cylinder, carries a pi on rod i l fees Qv which in turn supports theursual rock engaging pointer L. this instance centralized by a bushing O which exten s into a recess P of a valve chest Q interposed between the back head and feeding cylinder.

Fressure fluid is admitted into the drill through a connection It and tie adn'iission ofthe pressure, fluid to the cylinders controlled by a throttle valve S having throttle lever T. In this instance a chamber U is formed on one side of the back head to receive a spring V for holding the throttle valve to its seat.

Disposed within the cylinder A is a reciprocatory hammer piston W having a rearward extension X. Air is admitted into said cylinder throu h a port A and corn stantepressure is maintained in the ward end of the cylinder A. The distrihw tion of the pressure fluid to the front and rear faces of the piston W through supply ports Y and Zres-ipectivcly is controlled by the piston extension H. A spring pressed plunger 7) cooperates with r d pression 0 formed on the throttle leve= holding the throttle valve a ainst tion.

In accordan e with the practice of the in vention a chamber (Z is formed in-the valve chest Q to receive slidably a valve 8 for controlling the flow of pressure fluid to the feeding cylinder and for controlling the e: must of pressure fluid therefrom. A passage 7 leading from the throttle valve to the valve chamber is controlled by the valve 0 and communicates with the feeding cylinder H through a series of supply ports 9 former in the valve chest Pressure fluid thus admitted through the passage 7 into the valve chamber passes around the valve through an annular groove it formed near The cylinder H is in lit) rotation handle G.

one end of said valve and through the ports 9. An exhaust port is formed in the valve chest between the feeding cylinder II and the valve chamber (Z is adapted to communicate with mosphere through a port 0 formed near the outer end of the valve and through a passage p in a plug 9 screwed into the end of the valve chamber for retaining the valve within said chamber. A passage 7" leading from the throttle valve to the valve chamber admits pressure fluid to said chamber for opening the valve and closing the exhaust port 5. A spring 8 ar: and within the valve serves as a means for closing the valve and establishing communication between the feeding cylinder and atmosphere when the pressure fluid acting against the end face 25 of the valve is era-- hausted.

In this instance, the exhaust of pressure fluid from the end of the valve chamber is effected through a passage a communicating with a passage 11 formed through the A passage 20 l in an extension :0 of the handle communication for the passage r to a phere and is controlled by a sleeve y. The sleeve g may be like that described in my copending application, Serial l lo. 18,375, filed March 26, 1925. The amount of pressure fluid permitted to flow irom the valve chamber is in this instance controlled by needle valve 2 screwed into the end of the handle G to cooperate with a hollow plug 2 for regulating the size of the outlet opening of said plug. A nut 3 screwed on the end of the needle valve 2 serves to hold said needle valve in placed position.

In the operation of the machine, with the throttle valve S in the position shown in the drawings, pressure fluid admit ed through the connection R pas es simultaneously to the rearward end of the cylinder A and through the passage 1'' into the end of the chamber (Z and moves the valve 0 to the position shown in Figure In this position, the passage 7 is uncovered by the valve and pressure fluid passes around the valve 6 through the annular groove 7i and through the spaced ports 9 into the feedin cylinder H. The air thus entering the fecuing cylinder acts against the piston J and moves the drill toward the working face. It will be noted that in this position of the valve 6, the exhaust port 0 in said valve is moved out of communication with the exhaust port is in the valve chest. If, in case the drill steel becomes stuck in the drill hole and it is found desirable to remove the drill somewhat to free the drill steel, the sleeve 1 on the extension 00 of the rotation handle G may be pulled downwardly to uncover the passage w, whereupon a portion of the pressure fluid in the end of the chamber (Z is released and the valve 6 is moved toward the opposite end of the chamber (Z. In this manner one or more of the supply ports 5/ are covered by the valve. The supply of pressure fluid to the feeding cylinder H is reduced and at the same time the port 0 is brought into communication with the exhaust port 71; and a portion of the pressure fluid in the feeding cylinder II is exhausted to atmosphere through the valve and the passage 7).

I claim:

1. In a feed controlling device for rocl; drills, the combination of a percussive cylinder and a feeding cylinder, a bar-l: head for the percussive cylinder, a valve cl t having a chamber, a hollow fluid actuated control valve in said chest for controll' the feeding cylinder, a throttle valve or simultaneously admitting pressure fluid to the cylinders and the chamber, a hollow rotation handle associated with the control valve, a sleeve slidable on said handle for rele ing pressure fluid from one end of the cl'nunbcr and a spring for moving the control valve in one direction.

2. In a feed controlling device for rev-l: drills, the combination of a percussive cylinder and a feeding 'nder, a back valve head for the percussive cylinder, chest having a chamber and a series of spaced supply ports, a hollow fluid actuated reciprocatory valve in said chest for controlling the feeding cylinder and having an exhaust port, a throttle valve for controlling admission of pressure fluid to the cylinders and to the chamber, a supply passage leading from the throtde valve to the chamber for supplying pressure fluid to the feeding cylinder through c spaced supply ports, a second supply pas 5c lcailing from the throttle valve to the end of the chamber for admitting ire-name fluid to move the control valve in one direztion. an exhaust port in the chest adapted to register with the port in the con rol valve for opening th feeding cylinder to atmosphere, a spring in the control valve for bringing said ports into registration and for closing the spaced supply ports, a hollow rotation handle communicating with the end of the chamber, and a sleeve slidable on said handle for releasing pressure fluid from said chamber.

In testimony whereof I have si specification.

-ned this CHARLES C. HANSEN. 

